Optimization Of The Working Device Of Load-haul-dump Unit JCCY-2

With the expanding of the metal mining, the demand of Load-Haul-Dump Unit (LHD) is also increasing. However, LHD models in domestic are old. In order to adapting to the development of modern mining, it is necessary to make appropriate improvements on the models. As an important institution of the LHD, the working device can realize shoveling, loading, hauling and dumping minerals. Its rationality of design directly affects the performance of whole machine. Thus, the optimization of the working device has important practical significance.Working device of JCCY-2LHD of Jinchuan Group was selected as the object to study. Taking the minimum output force of the boom cylinder and the bucket cylinder of working device as object, the mathematical model of optimization of working device was established. Research ideas of this article is:to establish three-dimensional solid model of working device, to analog the movement conditions of the device through kinematics analysis and eliminate interference between components in the model, to supply movement time for the dynamic analysis, to identify the location of withstanding the force most to provides a theoretical basis for the establishment of mathematical optimization model of the working device. Then GA toolbox based on MATLAB software was used to optimize the work device and a strength analysis of bucket was taken. There are three parts presented and studied as follows.Firstly,3D solid model of the working device was built via Pro/E software. Kinematics analysis of working device was made in the Mechanism module under the. inserting, shoveling, lifting and unloading working conditions The unreasonable design of the components was excluded by interference analysis, making working device move smoothly and be ready for the simulation of different working conditions; Movement time for the dynamic analysis was supplied through the simulation of the conditions. Selecting two hinge point as the object of the analysis, displacement, velocity and acceleration curve were drawed in order to analyze the rationality of movement of the model. Subsequently, the3D model was import to ADAMS, a dynamic analysis software and dynamics simulation analysis of working device was taken in ADAMS/View module. In order to more realistically simulate the actual work two typical load distribution-centralized and partial load were selected to identify the location of the work device withstanding the force most. It provides a theoretical basis for the establishment of mathematical optimization model of the working device.Secondly, the mathematical optimization model of the six bars working device is established. Taking the minimum output force of the boom cylinder and the bucket cylinder of working device as object, selected12parameter variables, GA toolbox based on MATLAB software was used to optimize the work device. Comparing the data before and after optimization, and the optimal results was obtained.Finally, a strength analysis of bucket where the weakest position to wear was taken. Selecting the shoveling conditions withstanding the most force, the finite element ANSYS software was used to draw stress, strain and displacement contours to analyze if the parts withstanding stress and displacement most can meet the strength requirements., The results indicated that the strength of bucket can meet the requirements through calculating.